SEOUL, Feb. 4 (Yonhap) -- South Korea's president-elect Park Geun-hye urged North Korea on Monday to immediately drop its nuclear test plans amid increased movement at the test site that points to an imminent third blast.

A mine car has been spotted moving in and out of the western tunnel of the test site in Punggye-ri in the North's northeastern tip. A car believed to have been carrying a senior official was also spotted at the tunnel's western part, an official said on condition of anonymity, citing the issue's sensitivity.